Valve hone



E. A. HALL VALVE HONE Dec. 11, 1928. I 1,694,705

Filed Sept. 16, 1927 Patented Deci ll; 1928.

UNITED STATES 1,694,705 PATENT OFFICE.

PANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

VALVE HONE.

Application filed September 16, 1927.

- and improved adjustable means so that the tool is provided with a base or bed desired angle of cut may be readily determined. Further objects will hereinafter ap-.

pear.

A cardinal feature of this invention res des in the utilization of a non-rotatable grlnding element which is engageable with the valve rotating at a relatively high speed. This has been found to eliminate ridges and rough places which were produced when the valve was held stationary or rotated slightly and the grinding element rotated. Under former practice it was necessary to refinish the valves after they were ground to make the seating surface entirely smooth,but, in accordance with this invention, refinishing is unnecessary because after being ground the valve is entirely free from irregularities.

The invention is shown by way of illustration in the accompanying drawings, in which Fig. 1 is a top plan view of the grinding tool; Fig. 2 is a side elevation of the'tool with some parts broken away; Fig. 3 is a vertical sectional elevation on the line 4.4 of Fig. 2 showing the mechanism for adjusting the grinding element with respect to its holder.

Fig. 4 is a side view of the abrading element, holder and housing showing the housing in section.

Referring to the drawings, the grinding plate 1 suitably secured to a support by bolts extending through holes 2 at opposite sides thereof. Mounted on the bed plate 1 is a bracket 3 supporting a rotary chuck 4 which may be of the type having separable gripping jaws 5 to hold a valve stem 6 having the usual disc head 7, an adjustable knurled collar 8 en abling'the jaws 5 to be forced into gripping relation with the stem 6. The chuck is driven by an electric motor 9 operatively connected thereto by a belt 10'to enable the valve to be rotated at a high speed. Engageable with the seating surface of the valve head 7 is an abrading or grinding element 11 which may be square in cross section and which projects Serial No. 219,848.

beyond the ends of a sleeve-like holder 12. The holder 12 securely retains the grinding element 11 in fixed position.

The holder 12 is mounted in a housing 13 and for enabling it to be adjusted with respect to the housing, the holder is provided with an annulargroove 14 adj aceut each end, a disc 15 integral with an adjusting screw 16 engaging the outer groove. The screw 16 is threaded into the housing, and by adjustment thereof the grinding element may be moved in and out of the housing. As wear takes place the screw is turned to maintain the grinding element in engagement with the valve. After one end of the grinding ele-- ment is worn down, the holder 12 is removed and turned about to present the opposite end of the element 11. A set screw 17 in the housing 13 is adapted to engage the top of the holder 12 for retaining the latter in adjusted positlon. v

A taperedboss 18 extends at substantially right angles from one side of the housing 13 into a tapered socket in a shaft 19 and is held in place by a pin 20. The shaft 19 is disposed within a tubular support 21 and is held against rotation therein by a key 22. A tight shding fit between the support 21 and shaft ERNEST A. HALL, or TOLEDO, OHIO, ASSIGNOR To THE HALL MANUFACTURING COM- 19 is insured by a collar 23 having a tapered flange 24 and held in place by a screw 25.

In practice the shaft 19 is reciprocated within the support 21 to move the grinding block 11 across the seating surface of the valve. For that purpose alever 26 is pivoted at 27 to an extension 28 of the shaft 19, and a link 29 connects an intermediate part of the lever with the support 21. It is apparent that by swinging the lever arm 26 to and fro the abrading block 11 is readily moved transby swinging the frame30 in one direction or the other, the position of the grinding element ll is changed to vary the degree of cut in the valve head 7. As shown, the enter portion of theframe 30 is supported on an arcuately shaped guide 32 into which the heads of bolts 33 projeet. A pairof wing nuts 34 on the bolts 33 enable the frame to be secured in adjusted position.

In order to determine accurately the degree to which the valve head is to be ground, a scale is displayed on a plate integral w: th the guide 32 and extending outwardly therefrom. Cooperating with the scale 35 is a pointer 36 projecting from the frame 30. By adjusting the pointer 36 along the scale 35, the degree to which it is desired to grind the valve may be readily and conveniently deter mined. As shown, the scale 35 may display the numerals 30, and to indicate a 30, 45 or 60 angle of cut.

From the above description it is evident that I have produced a decidedly simple tool which can be readily put into operation for grinding valves of different sizes, it being merely necessary to insert the stem of the valve into the chuck and adjust the pointer to the degree to which it is desired to grind the valve. By moving the lever arm 26 back and forth, different portions of the grinding block 11 are brought into engagement with the valve, and, wear takes place, the screw 16 may be turned to feed the block forwardly.

\Vhile I have described my improved tool in more or less detail to comply with the requirements of the statute, it is nevertheless desired that this detailed description be considered merely as illustrative and not aslim iting, and it is to be understood that changes and modifications may be made by those skilled in this art without departing from the invention as defined in the following claims.

lVhat I claim as new and desire to secure by Letters Patent is:

1. In a valve grinding tool, a base, a valve holder on the base, a grinding support on the base mounted so that its axis is parallel to the surface of the valve to be ground, a shaft slidable in said support, a housing having a bore to receive an abrading element adjustable therethrough normal to the surface to be ground, means to mount said housing on the face to be ground, a boss extending at right angles from the housing and received in said socket, means to hold the boss against movement in the socket, and lever mechanism connected to the support and to said shaft for offecting reciprocation of the shaft.

In testimony whereof I have hereunto signed my name to this specification.

ERNEST A. HALL. 

